I tied with pagesonly turned off and I get same
I checked log file and those pdf's are there.
2005-10-19 16:16:14 W3SVC843222 192.168.1.201 GET /contacts/test.pdf - 80 - 192.168.1.12 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.1;+SV1;+.NET+CLR+1.0.3705;+.NET+CLR+1.1.4322) CFID=133757;+CFTOKEN=9bb09baa7a3906b-630890F5-B05F-B566-336CB820A673800A;+LASTPAGE= http://www.domain.com/ 200 0 0